[pjc50]

I bet someone will invent shared content for Docker containers in the next few years as a disk-saving measure.

[codegladiator]

That's called volume mounts and/or base images ?

[regularfry]

If I do an `apt-get install` of the same packages in different containers, with anything different at all before it in the Dockerfiles, there's no way to share a common layer that includes the package contents between those images.

You could volume mount /usr and chunks of /var to help, but I'm not sure that would be sane.

[radicalbyte]

There are storage systems which do this, de-dupe on disk level.